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| author | Stanislav Kinsbursky <skinsbursky@parallels.com> | 2013-04-01 11:40:51 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-02 10:09:01 -0700 |
| commit | 2dc958fa2fe6987e7ab106bd97029a09a82fcd8d (patch) | |
| tree | c260602e6d7233a0e05f252c0dfcb4dae587b9d2 | |
| parent | 118c9a45fdacc6fe57910fa1d048e2d5bbc193f4 (diff) | |
| download | lwn-2dc958fa2fe6987e7ab106bd97029a09a82fcd8d.tar.gz lwn-2dc958fa2fe6987e7ab106bd97029a09a82fcd8d.zip | |
ipc: set msg back to -EAGAIN if copy wasn't performed
Make sure that msg pointer is set back to error value in case of
MSG_COPY flag is set and desired message to copy wasn't found. This
garantees that msg is either a error pointer or a copy address.
Otherwise the last message in queue will be freed without unlinking from
the queue (which leads to memory corruption) and the dummy allocated
copy won't be released.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | ipc/msg.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/ipc/msg.c b/ipc/msg.c index 31cd1bf6af27..fede1d06ef30 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -872,6 +872,7 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, goto out_unlock; break; } + msg = ERR_PTR(-EAGAIN); } else break; msg_counter++; |